An Unusual Initial Presentation of Lupus Nephritis as a Renal Mass

Table 1

Investigation results at time of partial nephrectomy specimen and subsequent kidney biopsy after 12 months of clinical follow-up.

Investigation	Results
	Partial nephrectomy	Biopsy
Serum creatinine	60 μmol/L	61 μmol/L
Microscopic hematuria	3–5 red blood cells per field	3–5 red blood cells per field
Urinary albumin/creatinine ratio	7.6 mg/mmol	10 mg/mmol
ANA titer	<1 : 80	<1 : 80
Anti-DNA	424 × 10^3 IU/L	<55 × 10^3 IU/L
Anti-SSA/Rho	10.4 IU/L	—
Anti-SSB/La	15.9 IU/L	—
C3 complement	1.22 g/L	1.08 g/L
C4 complement	0.15 g/L	0.19 g/L
Serum IgG	28.7 g/L	—
IgG4 subclass	0.6 g/L	—